stats refresher (simple terms)

Question 1

tells how far apart the lowest and highest numbers are, but one very big or small number can mess it up.

Answer 1

Range

Question 2

shows the spread of the middle part of the data, ignoring the really high and low scores.

Answer 2

Interquartile range

Question 3

just half of the IQR and gives a sense of how spread out the middle is.

Answer 3

Semi-Interquartile range

Question 4

tells how much, on average, the numbers differ from the usual (average) number.

Answer 4

Average deviation

Question 5

It shows how spread out the numbers are from the average.

Answer 5

Standard deviation

Question 6

is the average of how much each number is different from the average, but using squared differences.

Answer 6

Variance

Question 7

to indicate that individual scores have been used and the data have not been grouped.

Answer 7

Simple frequency distribution

Question 8

: test-score intervals, also called class intervals, replace the actual test scores.

Answer 8

Grouped frequency distribution

Question 9

: results from the conversion of a raw score into a number indicating how many standard
deviation units the raw score is below or above the mean of the distribution.

Answer 9

Z score

Question 10

can be called a fifty plus or minus ten scale; that is, a scale with a mean set at 50 and a
standard deviation set at 10.

Answer 10

T score

Question 11

is a number that provides us with an index of the strength of
Coefficient of Correlation/ Correlation Coefficient

Answer 11

Coefficient correlation